I've got a bit of working out to do to fit the crank pulley on my 2.1 pinto (fan belt one) as I've got a longer nose on the crank

I got a couple of old 1 part cast pulleys that are supposed to come from pintos - but ones a good 0.75" to 1.0" bigger diamiter

did these come in differnent sizes ?

what's size should it be ?

Probably doesn't matter that much. Smaller one will mean less power taken from engine to drive alternator/water pump but bigger one will give you more output from alternator and possibly increased collant flow rate.

Depends on your priorities, personally I'd probably go for the samller one, I doubt the reduction in coolant flow will make much (if any) difference.

More or less what I was thinking
i.e. - fit the smaller one and then play with the ratio's if I have to - it would still be nice to know what the standard size ones are - then I know what I'll be changing it from

but I was really just wondering if these could both of come from a pinto or if ones from an X-flow, Essex or something else... ??